How does the modern study of history challenge earlier histories

Early historians used unreliable sources to write history. They had to believe mainly on sources which were believed by people. Modern day historians has many instruments and theories to prove an incident of history. Scientific advancements has helped calculate the accuracy of any event. Carbon dating is one of the many scientific advancements helping modern day historians. This test helps them to find out the age of any fossil found, thus giving an accuracy and reliability of the sources which will be documented.

zoom in on the bill of rights. the other side was just as divided: some antifederalists opposed the constitution only because it lacked a bill of rights, and others opposed it on other grounds and merely used the bill of rights as an excuse to campaign against it.

where are the statements?